omgwtfgames/csg.cs — pull request #3 by omgwtfgames (2014-11-12 07:20:50+00:00)
Title: Vertices with same position and normals are now collapsed into a single shared vertex.

Fixes bug #2, but doesn't deal with "T-junctions" yet (cases where vertices lie along an edge of a triangle that does not involve that vertex).